What is the system its going to power like ?
I can't remember which series from OCZ isn't too good as there are some reliability problems, I think its the StealthXtream, but not sure. Anyhow, OCZ isn't part of the prefered brands when it comes to PSU.

What is the budget? Personally I would never go for a lower end PSU its just too crucial of a component to skimp on. Is there any reason for the 700W or just best price/watt combo? Depending on the system I would suggest going with a quality 500 - 650W PSU (Seasonic, Antec, Cosair, Silverstone).

I'm going to assume that your budget may be a bit tight for Strider quality (as you were asking about the $49 modstream deal) and mention the OCZ Z-Series 650w for $65 (AR) from DirectCanada. The OCZ-Z series seem pretty basic (made by PC Power & Cooling at least) but are supposed to be 80+ Silver (up to 88% efficient) but not much info/reviews are available yet.
I just picked up this unit (Z-Series 650w) and I'll be testing it out tonight.
2c